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ppc/amigaone: Allow running AmigaOS without firmware image 

The machine uses a modified U-Boot under GPL license but the sources
of it are lost with only a binary available so it cannot be included
in QEMU. Allow running without the firmware image which can be used
when calling a boot loader directly and thus simplifying booting
guests. We need a small routine that AmigaOS calls from ROM which is
added in this case to allow booting AmigaOS without external firmware
image.

Fixes: d9656f860a ("hw/ppc: Add emulation of AmigaOne XE board")
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
BALATON Zoltan 2023-11-28 02:32:53 +01:00 committed by Nicholas Piggin
parent c1dc0a1deb
commit e25acd6191
1 changed files with 23 additions and 12 deletions
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35
hw/ppc/amigaone.c
View File

@ -36,10 +36,19 @@
* -device VGA,romfile=VGABIOS-lgpl-latest.bin
* from http://www.nongnu.org/vgabios/ instead.
*/
#define PROM_FILENAME "u-boot-amigaone.bin"
#define PROM_ADDR 0xfff00000
#define PROM_SIZE (512 * KiB)
/* AmigaOS calls this routine from ROM, use this if no firmware loaded */
static const char dummy_fw[] = {
0x38, 0x00, 0x00, 0x08, /* li r0,8 */
0x7c, 0x09, 0x03, 0xa6, /* mtctr r0 */
0x54, 0x63, 0xf8, 0x7e, /* srwi r3,r3,1 */
0x42, 0x00, 0xff, 0xfc, /* bdnz 0x8 */
0x7c, 0x63, 0x18, 0xf8, /* not r3,r3 */
0x4e, 0x80, 0x00, 0x20, /* blr */
};
static void amigaone_cpu_reset(void *opaque)
{
PowerPCCPU *cpu = opaque;
@ -60,8 +69,6 @@ static void amigaone_init(MachineState *machine)
PowerPCCPU *cpu;
CPUPPCState *env;
MemoryRegion *rom, *pci_mem, *mr;
const char *fwname = machine->firmware ?: PROM_FILENAME;
char *filename;
ssize_t sz;
PCIBus *pci_bus;
Object *via;
@ -94,20 +101,24 @@ static void amigaone_init(MachineState *machine)
}
/* allocate and load firmware */
filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, fwname);
if (filename) {
rom = g_new(MemoryRegion, 1);
memory_region_init_rom(rom, NULL, "rom", PROM_SIZE, &error_fatal);
memory_region_add_subregion(get_system_memory(), PROM_ADDR, rom);
rom = g_new(MemoryRegion, 1);
memory_region_init_rom(rom, NULL, "rom", PROM_SIZE, &error_fatal);
memory_region_add_subregion(get_system_memory(), PROM_ADDR, rom);
if (!machine->firmware) {
rom_add_blob_fixed("dummy-fw", dummy_fw, sizeof(dummy_fw),
PROM_ADDR + PROM_SIZE - 0x80);
} else {
g_autofree char *filename = qemu_find_file(QEMU_FILE_TYPE_BIOS,
machine->firmware);
if (!filename) {
error_report("Could not find firmware '%s'", machine->firmware);
exit(1);
}
sz = load_image_targphys(filename, PROM_ADDR, PROM_SIZE);
if (sz <= 0 || sz > PROM_SIZE) {
error_report("Could not load firmware '%s'", filename);
exit(1);
}
g_free(filename);
} else if (!qtest_enabled()) {
error_report("Could not find firmware '%s'", fwname);
exit(1);
}
/* Articia S */